UC3843 ,SMPS ControllerUC3842/UC3843/UC3844/UC3845SMPS Controller
UC3843A ,Current mode PWM control circuit.3AN1080/DIf the efficiency is taken into account and it is assumed that L 1.66 mHpthe typical con ..
UC3843A ,Current mode PWM control circuit.features to implement off-line or DC toDC fixed frequency current mode control schemesDifferences b ..
UC3843A ,Current mode PWM control circuit.
UC3843A ,Current mode PWM control circuit.
UC3843A ,Current mode PWM control circuit.UC284XAUC384XAHIGH PERFORMANCE CURRENT MODE PWM CONTROLLERNOT FOR NEW DESIGN1
UMX2N , General purpose (dual transistors)
UMX2N , General purpose (dual transistors)
UMX4 N , High transition frequency (dual transistors)
UMX4 NTR , Two 2SC3837K chips in a EMT or UMT or SMT package.
UMX4N , High transition frequency (dual transistors)
UMX4NTR , Two 2SC3837K chips in a EMT or UMT or SMT package.
UC3843
SMPS Controller
Features Low Start up Current Maximum Duty Clamp UVLO With Hysteresis Operating Frequency up to 500KHz
DescriptionThe UC3842/UC3843/UC3844/UC3845 are fixed
frequencycurrent-mode PWM controller. They are specially
designed for Off-Line and DC to DC converter applications
with minimum external components. These integrated
circuits feature a trimmed oscillator for precise duty cycle
control, a temperature compensated reference, high gain
error amplifier, current sensing comparator and a high
current totempole output for driving a Power MOSFET. The
UC3842 and UC3844 have UVLO thresholds of 16V (on)
and 10V (off). The UC3843 and UC3845 are 8.5V(on) and
7.9V (off). The UC3842 and UC3843 can operate within
100% duty cycle. The UC3844 and UC3845 can operate
with 50% duty cycle.
